Blow torch



A. P. KRAMER Aug. 14, 1934.

' BLOW TORCH Filed Feb. 25, 1928 INVENToR.- Ell/:kranen ATTORNE Patented Aug. 14, 1934 Price Arent This invention relates to blow torches, and

more particularly to a burner head for blow torches and automatic regulating means for such burner head.

The main object of the invention is to vprovide novel automatic regulating means for gasoline` blow torches, whereby the full fuel flow of the torch may be automatically shut off, and which means may be easily and quickly operated toY the burner head 4, andthe' stein 16 has threads Another object is to provide blow torch regu-` Vinstantaneously supply a full fuel flow.

lating means of the character above stated in the form of an attachment which may be attached to standard blow torches now on the market.

The invention is particularly usefulV when the operator is required to work in close quarters and when it is necessary to set the torch down when not in use. My invention provides a novel and simple means wherebya workman may in such 2 close. quarters safely use a torch.

It is an important aid to fuel economyand a' highvgrade fuel may be used in my torch at about the same or lower cost as a low grade fuel could be used in torches heretofore.

The invention includes the parts and combinations 'of parts more particularly hereinafterreferred to.

.Other objects7 advantages and -features of in-A tudinal section of my invention. Dotted lines indicate the .parts in fullfuel fiowposition.

In the drawing, l designates a liquid fuel tank of common constructionfor containing gasoline or other suitable liquid fuel, in-the top of which tank is welded an outlet tube 2. The tank has the usual pump arrangement (not shown) common to blow torches for forcing the fuel from the tank into the burner. The upper en d 3 of the outlet tube 2 is threaded and screw seated in the lower side of a burner head 4 and is in communication with the fuel inlet 5 of said head.

A small open fuel receptacle 6 is secured on the outlet tube 2 between the top of the tank 1 and the under side of the burner head 4 by means "of a set screw a. The tube 2 extends upwardly through said receptacle 6. The head 4 is provided with a full fuel flow duct 7 and with a pilot fuel flow duct 8 leading forwardly from the main fuel inlet 5, said fuel ducts converge into a single fuel outlet duct 9 that extends through the for `The iigure in the drawing isa vertical longir ward end of the head;4. On the forward end of the burner head 4 is tted the usual torch nozzle' 10 into which the outlet duct`9 opens. Valve seats 1l andV 12 are respectively provided-in the fuel ducts 7 and 8 for valves 1 3 'and l4 respective1y and which valves areformed in the forward ends@ of stems 15 andl respectively. i The valve stems 15 and 16 extend rearwardly through stuffing boxes, 17 and`18 respectively in the rear end of 19 which engagethreadsmZO in thegland 21' =ofv the stuffing box' 18. A hand wheel 22 is secured onv the outer "rear end of the valve stem 16 for turning vthe stein to open` or close the valve `-14.

The valve stem 15 slidably `extends through the gland 23 of stuffing box 17. Where they valve' stems'l' and 16 pass through the burner 4, cutting across'the 4fuel passage 5, the bores. through which'theyV pass are substan-Vv tially larger than the diameters of the valve stems, so that suicient space is allowed for the fuel' vapor mixture to pass around, the valve stems to the valve seats 11 and 12. The enlarged portions extendfrom the stuffing .boxes 17 and 18 to the valve seatsll and 12 respectively and aredenoted by numerals12`a and 13a.v Automatic control means for controlling the flow offuel fromthe tank to the torch' nozzle are provided and include a bell Icrank lever 26, a sleeve arm 27, an operating lever 28, a clamp bracket 29 connecting one Aarm of said bell crank lever and one end of the operating lever 2 8, and a spring 32y engaging the operating lever 28. The sleeve arm 27 is pivoted at its upperend at 33 to the rear end of the valve stein 15 and telescopes over the arm 26a o f b ellcrank' lever 26. The bell crank lever 26 is pivoted `at 34 to the outer end of'a support or arm35 secured by screws A356 to the fuel receptacle 6. V.'Iflie. .clamp `bracketj29 is clamped about the upperconnecting member 4370i the handle 38,of the "liquid fuel vtank l and the spring 32l bears against said connecting member and the lever 28 and normally urges said lever up, and through the medium of said lever, link 31, bell crank lever 26, and its arm 26a, sleeve arm 27 and stem 15, normally holds the valve 13 upon its seat 11 in closed position.

VIn operation, the valve 14 is adjusted to provide a pilot ame and a small quantity of fuel is admitted to the fuel receptacle 6 through the orifice 99 formed in the nozzle l0 as is common practice and after the burner head is heated by burning such quantity of fuel in the receptacle 6 for the usual purpose, a full flow of fuel is obtained by the on which the lever 248 is pivoted at 3 0, a link 3 1 handle secured to said tank; a burner head detachably connected to said tank; a fuel passage vopening of the valve 13.

operator grasping the handle 38 and with his thumb, he may conveniently depress the lever 28 and instantly open the valve 13 through the medium of link 31, bell crank 26, sleeve arm 2'7 and stem 15 so that a full flow of fuel will pass from the tank 1 through outlet tube 2, inlet 5, ducts 7 and 9 to the nozzle 10 where it is burned. While using the torch the operator usually holds the tank 1 in one hand by grasping the handle 38 and may, without difcultykeep his thumb on the lever 28 and hold the valve 13 open so that the full fuel flow will pass through the torch and maintain a full flame, or such pressure of the thumb on lever 28 may be removed and the pilot flame will keep the torch burning low for instant use when full fuel flow is desired.

The size of the fuel flame can be regulated by means of the set-screw 40 in the handle 38. The adjustment of the screw will limit the downward travel of lever 28 and consequently the extent of The further the screw 40 is turned into the handle 38, the wider the valve 13 will be opened and the greater will be the ame in the nozzle.

When the operator releases the lever 28, the spring 32 automatically closes the valve 13 through the medium of lever 28, link 31, bell crank 26, sleeve arm 27 and stem 15, and shuts off the `full fuel flow through the burner head while the pilot valve 14 remains open and the pilot flow of fuel mechanic, and is within the spirit of this inven- I claim:

1. In a blow torch, a fuel containing tank; a burner head, there being a passage connecting zsaid tank and said head including a full fuel flow duct, and a valve controlling said duct; a bell crank; a sleeve arm telescoping over one arm of said bell crank and pivoted to one end of said valve; an operating lever; a link connecting said -lever and the other arm of said bell crank; and

means for normally holding said valve in closed position, said operating lever being mounted rel ative to said torch in position to be operated by the thumb of the operator for opening said valve.

2. In a blow torch, a fuel containing tank; a

in said burner head; a valve controlling said passage; a bell crank; a sleeve arm pivoted to one end of said valve, and telescoping overone arm of saidbell crank; a clamp bracket connected to said handle; an operatinglever pivoted to said clamp bracket; a link connecting said operating lever and one arm of said bell crank, and means for normally holding said valve in closed position.

3. In a blow torch, the combination of a fuel containing tank; a burner head; a fuel passage leading from said tank to said head, a valve in said head controlling said passage; an operating lever mounted on said tank in positionv to be depressed by the operator when said tank is held in one hand; means interposed between said lever and said valve whereby said valve is opened when said lever is depressed and closed when said lever is elevated, and means for normally 'holding said lever elevated.

4. Ina blow torch, the combination of a fuel containing tank; a burner head connected to receivefuel from said tank; a fuel outlet duct opening from said head; means for permitting a predetermined amount of fuel flow from said tank to said duct; and means connected to said tank and to said head for permitting increased flow of fuel from said tank through said duct when said tank is held by an operator.

5. In a blow torch, the combination of a fuel containing tank; a burner head connected to receive fuel from said tank; a fuel outlet duct opening from said head; means for permitting a predetermined amount of fuel flow from said tank to said duct; means connected to said tank and to said head for permitting increased flo-w of fuel from said tank through said duct when said tank is held by an operator; and means for holding said last mentioned means in position to normally prevent increased flow of fuel from u said tank to said-duct.

6. In a blow torch comprising a fuel containing tank; a burner head connected to receive fuel from said tank; a fuel outlet duct opening from said head; a plurality of passages in said head opening into said duct; means for permitting a predetermined amount of fuel flow from one of said passages to said duct; regulating means rigidly mounted on said tank adapted to control the fuel flow into said duct from the L conducting a predetermined amount of fuelfrom said tank to said duct; a slidable valve in said means; and means for operating said valve to increase the flow of g fuel from said tank through said duct operable by the thumb of the operator when said tank is held by said handle.

ARTHUR P. KRAMER. 

